Big credit to David Goffin - and serious concerns about the umpire....
Goffin's ball is sliced, quite slow, takes the outside of the line, Sinner is on the ball, it's called out, Sinner hits the ball back over into Goffin's half.....
Goffin queries the call, umpire looks, overrules, calls it in, and awards the point to Goffin.
Sinner looks completely befuddled - the umpire sticks firm - and Goffin tells the umpire the guy got it back over, it has to be replayed - credit to him.
Especially as then gets broken...
Yes, rather better than I recall from Angie Kerber in a very similar situation, if surely just the right thing to do.